Steam-generator.



No. 737,288. PATBNTED AUG. 25, 1903.

- J. scHfITTB. I

STEAM GENERATOR.

' APPLIQATLON FILED JUNE 2, 19Q3.

N0 MODEL.

UNITED STATES- Patented August 25, 1903.

PATENT OFFICE.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 737,288, dated August 25, 1903. Application filed June 2, 1903. Serial No. 159,768 (No model.)

To aZZ whom it may concern:

Be it known that I, J OHANN SOHIITTE, a subject of the Emperor of Germany, residing at 79 Deichstrasse, Bremerhaveu, in the Republic of Bremen and Empire of Germany, have invented new and useful Improvements'in Steam-Generators, of which the following is a specification.

My invention relates to steam-generators chiefly designed for marine purposes, and has for its object to combine with a cylindrical boiler having return fire-tubes a water-tube boiler in such a manner as to achieve in addition to the advantages affordedbycylindrical boilers those of rapid vaporization,

comparatively small weight, simplicity of construction, and durability.

In the accompanying d rawings I have shown a constructional form of the improved generator, Figure 1 being a vertical longitudinal section, and Fig. 2 a front elevation of the same. r

The cylindrical boiler 1 is furnished with a series of return fire-tubes 2 and an underne'ath fire-box 3. Behind this fire-box Iprovide a transverse drum 4, supported in the metallic casing 5 of the generator, which also carries the cylindrical boiler 1 and has in its front the fire-box door 6 and ash-box door 7.

By means of two tubes 8 and 9 the drum 4is set in communicationwith the lower part or water-space of the boiler 1. Above the drum 4 is arranged a second transverse drum 10, placed behind the top part' of the cylindrical boiler 1, with which it communicates through last series of water-tubes but one, 16, are bent into the plane of the last series 17 at the rear, so that these two series form a kind of wall, which is protected at the rear by a wall 18.

From the lower part of the fire-tube boiler 1 a horizontal partition 19, of fire-brick, extends rearward to the cluster of water-tubes, and to the front part of the said boiler is fixed the chimney 20, into which the fire-tubes 2 'open.

The water fed into the generator through a pipe 21 passing into the upper drum 10 fills the water-spaces up to about the middle of the said drum and connecting-tube 11, leaving steam-chambers'inthe top part of the drum as well as in that of the cylindrical 6o boiler. First the flames and products of combustion heat the lower part of the fire-tube boiler 1, then the lower dru1n4 and the lower part of the several series of water-tubes. In their upward passage in the flue they circulate all around the water-tubes, heating the whole length of the same and also the upper drum 10, whereupon they pass through the return fire-tubes 2 to the chimney 20. In this way a very active circulation of water is set up, the water passing upward in the series of water-tubes 12 to 17, through the upper drum 10 and connecting-tube 11, down the fire-tube boiler, and through the tubes 8 and 9 to the lower drum, and back to the water-tubes.

What I claim as my invention, and desire to secure by Letters Patent, is-- In a steam-generator of the character set forth, the combination with a cylindrical boiler having. an underneath fire-box and a series of return fire-tubes, of a water-tube boiler having a transverse drum at the rear of the fire-box, and a second transverse drum arranged above the first and communicating therewith by several series of bent watertubes, two tubes connecting the lower drum with the lower part of the cylindrical boiler, anda tube connecting the upper drum with the upper part of the said cylindrical boiler, substantially as herein specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHANN soHurTE.

Witnesses: I

BERTZER, H. ROTHE. 

